Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1[ 70.015065][ T27] kauditd_printk_skb: 5 callbacks suppressed G[ ok [39;[ 70.015078][ T27] audit: type=1800 audit(1561217385.712:33): pid=9378 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 49m8[?25h[?0c[ 70.046014][ T27] audit: type=1800 audit(1561217385.712:34): pid=9378 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 . Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 72.979224][ T27] audit: type=1400 audit(1561217388.672:35): avc: denied { map } for pid=9558 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.144' (ECDSA) to the list of known hosts. executing program executing program executing program [ 1090.791733][ T27] audit: type=1400 audit(1561218406.492:36): avc: denied { map } for pid=9570 comm="syz-executor778" path="/root/syz-executor778153754" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 1195.810247][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1195.817294][ C0] (detected by 0, t=10502 jiffies, g=8969, q=26) [ 1195.823747][ C0] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295056736-4295046233), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 1195.837115][ C0] syz-executor778 R running task 26464 9577 9576 0x00004000 [ 1195.845041][ C0] Call Trace: [ 1195.848334][ C0] [ 1195.851202][ C0] sched_show_task.cold+0x291/0x2fc [ 1195.856422][ C0] rcu_sched_clock_irq.cold+0xaaf/0xbfd [ 1195.861982][ C0] update_process_times+0x32/0x80 [ 1195.867024][ C0] tick_sched_handle+0xa2/0x190 [ 1195.871886][ C0] tick_sched_timer+0x47/0x130 [ 1195.876656][ C0] __hrtimer_run_queues+0x33b/0xdd0 [ 1195.881869][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 1195.887250][ C0] ? hrtimer_start_range_ns+0xc70/0xc70 [ 1195.892807][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1195.898546][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 1195.904633][ C0] hrtimer_interrupt+0x314/0x770 [ 1195.909592][ C0] smp_apic_timer_interrupt+0x111/0x550 [ 1195.915153][ C0] apic_timer_interrupt+0xf/0x20 [ 1195.920095][ C0] [ 1195.923049][ C0] RIP: 0010:ext4_write_checks+0x1/0x260 [ 1195.928697][ C0] Code: 61 fa ff ff e8 e0 3c 53 ff 55 48 89 e5 41 54 49 89 fc e8 f2 0a 81 ff 4c 89 e7 31 f6 e8 98 f9 ff ff 41 5c 5d c3 0f 1f 40 00 55 <48> 89 e5 41 56 41 55 49 89 f5 41 54 53 48 89 fb e8 ca 0a 81 ff 48 [ 1195.948312][ C0] RSP: 0018:ffff888093a97640 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 1195.957131][ C0] RAX: ffff88809901c100 RBX: ffff888093a977d8 RCX: ffffffff81efcb42 [ 1195.965122][ C0] RDX: 0000000000000000 RSI: ffff888093a97a08 RDI: ffff888093a977d8 [ 1195.973136][ C0] RBP: ffff888093a97768 R08: ffff88809901c100 R09: ffff88809901c9c8 [ 1195.981125][ C0] R10: ffff88809901c9a8 R11: ffff88809901c100 R12: 0000000000000001 [ 1195.989127][ C0] R13: ffff8880995df4f0 R14: ffff888093a97740 R15: 0000000000000000 [ 1195.997140][ C0] ? ext4_file_write_iter+0x252/0x1070 [ 1196.002726][ C0] ? ext4_file_write_iter+0x2c4/0x1070 [ 1196.008200][ C0] ? save_stack+0x5c/0x90 [ 1196.012552][ C0] ? save_stack+0x23/0x90 [ 1196.016894][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1196.022730][ C0] ? ext4_file_mmap+0x410/0x410 [ 1196.027603][ C0] ? ___might_sleep+0x163/0x280 [ 1196.032473][ C0] ? __might_sleep+0x95/0x190 [ 1196.037167][ C0] do_iter_readv_writev+0x5f8/0x8f0 [ 1196.042445][ C0] ? no_seek_end_llseek_size+0x70/0x70 [ 1196.047921][ C0] ? rw_verify_area+0x126/0x360 [ 1196.052789][ C0] do_iter_write+0x184/0x610 [ 1196.057393][ C0] ? rcu_read_lock_sched_held+0x110/0x130 [ 1196.063122][ C0] ? __kmalloc+0x5d2/0x740 [ 1196.067565][ C0] vfs_iter_write+0x77/0xb0 [ 1196.072094][ C0] iter_file_splice_write+0x65c/0xbd0 [ 1196.077479][ C0] ? atime_needs_update+0x5f0/0x5f0 [ 1196.082702][ C0] ? page_cache_pipe_buf_steal+0x2b0/0x2b0 [ 1196.088539][ C0] ? rw_verify_area+0x126/0x360 [ 1196.094903][ C0] ? page_cache_pipe_buf_steal+0x2b0/0x2b0 [ 1196.100727][ C0] direct_splice_actor+0x123/0x190 [ 1196.105852][ C0] splice_direct_to_actor+0x366/0x970 [ 1196.111249][ C0] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1196.116811][ C0] ? do_splice_to+0x180/0x180 [ 1196.121528][ C0] ? rw_verify_area+0x126/0x360 [ 1196.126399][ C0] do_splice_direct+0x1da/0x2a0 [ 1196.131264][ C0] ? splice_direct_to_actor+0x970/0x970 [ 1196.136999][ C0] ? rcu_read_lock_sched_held+0x110/0x130 [ 1196.142753][ C0] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 1196.148220][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1196.154471][ C0] ? __sb_start_write+0x1ac/0x360 [ 1196.159508][ C0] do_sendfile+0x597/0xd00 [ 1196.163957][ C0] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1196.169281][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1196.175710][ C0] ? _copy_from_user+0xdd/0x150 [ 1196.180668][ C0] __x64_sys_sendfile64+0x15a/0x220 [ 1196.185882][ C0] ? __ia32_sys_sendfile+0x230/0x230 [ 1196.191190][ C0] ? do_syscall_64+0x26/0x680 [ 1196.195888][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 1196.201889][ C0] ? trace_hardirqs_on+0x67/0x220 [ 1196.206938][ C0] do_syscall_64+0xfd/0x680 [ 1196.211465][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1196.217374][ C0] RIP: 0033:0x4417c9 [ 1196.221284][ C0] Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1196.240898][ C0] RSP: 002b:00007ffce5c38198 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1196.249328][ C0] RAX: ffffffffffffffda RBX: 00007ffce5c38340 RCX: 00000000004417c9 [ 1196.257313][ C0] RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 1196.265391][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1196.273393][ C0] R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 1196.281374][ C0] R13: 00000000004024a0 R14: 0000000000000000 R15: 0000000000000000 [ 1196.289388][ C0] rcu: rcu_preempt kthread starved for 10549 jiffies! g8969 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 1196.300504][ C0] rcu: RCU grace-period kthread stack dump: [ 1196.306685][ C0] rcu_preempt R running task 29056 10 2 0x80004000 [ 1196.314606][ C0] Call Trace: [ 1196.317918][ C0] __schedule+0x7cb/0x1560 [ 1196.322350][ C0] ? __sched_text_start+0x8/0x8 [ 1196.327213][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1196.333123][ C0] ? schedule_timeout+0x47c/0xc50 [ 1196.338171][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 1196.343488][ C0] schedule+0xa8/0x260 [ 1196.347605][ C0] schedule_timeout+0x486/0xc50 [ 1196.352492][ C0] ? usleep_range+0x170/0x170 [ 1196.357207][ C0] ? trace_hardirqs_on+0x67/0x220 [ 1196.362257][ C0] ? kasan_check_read+0x11/0x20 [ 1196.367142][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 1196.372726][ C0] ? prepare_to_swait_exclusive+0x120/0x120 [ 1196.378651][ C0] rcu_gp_kthread+0x9b2/0x18b0 [ 1196.384422][ C0] ? kasan_check_write+0x14/0x20 [ 1196.389393][ C0] ? wait_rcu_exp_gp+0x50/0x50 [ 1196.394181][ C0] ? trace_hardirqs_on+0x67/0x220 [ 1196.399225][ C0] ? kasan_check_read+0x11/0x20 [ 1196.404097][ C0] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 1196.409919][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1196.416213][ C0] ? __kthread_parkme+0xfb/0x1b0 [ 1196.421203][ C0] kthread+0x354/0x420 [ 1196.425297][ C0] ? wait_rcu_exp_gp+0x50/0x50 [ 1196.430079][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 1196.436422][ C0] ret_from_fork+0x24/0x30